It should have been the must-see movie of the Christmas season, directed and co-written by the critically acclaimed Terry Gilliam ("Brazil," "12 Monkeys") and featuring the marquee cast of Johnny Depp, Jude Law, Colin Farrell and, in his final role, Heath Ledger. Instead, "The Imaginarium of Doctor Parnassus" is a disaster, incomprehensible from its opening minutes to the final credits.